Free Current Electricity MCQs with Answers
1,052 Current Electricity MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
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1,052 questions · page 13 of 53
- A. Electric flows
- B. Electric current
- C. Pot difference
- D. Ampere
Explanation: The correct term for the net charge flowing per unit time is "electric current" (option B), measured in amperes
Correct answer: Electric current- A. Heating effect
- B. Chemical effect
- C. Magnetic effect
- D. None of above
Explanation: An electric heater operates by converting electrical energy into heat energy.
Correct answer: Heating effect- A. Heat energy
- B. Nuclear energy
- C. Mechanical energy
- D. Chemical energy
Explanation: The question is about the type of energy converted into electrical energy by a thermocouple.
Correct answer: Heat energy- A. Ampere
- B. Coulomb
- C. Volt
- D. Ohm
Explanation: The ampere (A) is the SI unit of electric current. It represents the rate of flow of electric charge past a point in a circuit.
Correct answer: Ampere- A. Charles law
- B. Amperes law
- C. Coulombs law
- D. Ohm's law
Explanation: The property where the current flowing through a conductor is directly proportional to the potential difference across its ends, at a…
Correct answer: Ohm's law- A. Molecules in motion
- B. Electrons at rest
- C. Charge in motion
- D. Atoms in notion
Explanation: "charges in motion," emphasizes the significance of electric charges, typically electrons, flowing through conductive materials.
Correct answer: Charge in motion- A. Positive charges
- B. Negative charges
- C. Both (a) and (b)
- D. None of these
Explanation: The conventional current refers to the direction of electric current assumed to flow from the positive terminal to the negative terminal…
Correct answer: Positive charges- A. 40 coulomb
- B. 60 coulomb
- C. 2 coulomb
- D. None of these
Explanation: To find the charge passing through the conductor in one minute, multiply the current (I) by the time (60 seconds) since 1 minute equals 60…
Correct answer: 60 coulomb- A. 1 0-3 m/s
- B. 10-4 m/s
- C. 1 0-6 m/s
- D. 103 m/s
Explanation: The drift speed of electrons in a conductor, which refers to the average velocity of electrons as they move in response to an electric…
Correct answer: 1 0-3 m/s- A. Connected to a voltage source
- B. Not connected to voltage source
- C. At different values of potential
- D. Both (a) and (c)
Explanation: When the ends of a wire are connected to a voltage source (option A) or at different values of potential (option C), an electric field is…
Correct answer: Both (a) and (c)- A. Feed back effect
- B. Joule's effect
- C. Compton effect
- D. Photo electric effect
Explanation: The correct option is B) Joule's Effect. This refers to the heating of a conductor when electric current flows through it, caused by the…
Correct answer: Joule's effect- A. No heat is produced in wire
- B. More heat is produced in thin wire
- C. More heat is produced in thick wire
- D. None of these
Explanation: The correct option, C) More heat is produced in thick wire, highlights that when the same current passes through both thick and thin wires…
Correct answer: More heat is produced in thick wire- A. Variable velocity
- B. Uniform velocity
- C. Drift velocity
- D. Instantaneous velocity
Explanation: Drift Velocity, refers to the average velocity gained by electrons in a conductor when placed in an electric field.
Correct answer: Drift velocity- A. Very good conductor
- B. An insulator
- C. Moderately good conductor
- D. None of these
Explanation: The correct option is A. Very good conductor.This option indicates that the wire has high conductance, meaning it allows a large amount of…
Correct answer: Very good conductor- A. No change
- B. Smaller
- C. Larger
- D. None of These
Explanation: In certain cases, small bends in a wire might not significantly alter its electrical resistance, especially if the wire is made of a…
Correct answer: No change- A. A constant potential is maintained across the wire
- B. Net current is zero
- C. A constant potential difference is maintained across the wire
- D. None of these
Explanation: An electric field is generated along a wire when there is a potential difference (voltage) applied across it.
Correct answer: A constant potential difference is maintained across the wire- A. Increasing
- B. Decreasing
- C. Zero
- D. Maintained constant
Explanation: To have a constant current through a wire, a constant potential difference (voltage) needs to be maintained across its ends.
Correct answer: Maintained constant- A. Same
- B. Zero
- C. Different
- D. None of these
Explanation: When two spherical conducting balls at different potentials are joined by a metallic wire, they will eventually reach the same potential.
Correct answer: Same- A. Solar cell
- B. Photo voltaic cell
- C. Dry cell
- D. None of these
Explanation: Dry cells, such as the common household batteries, convert chemical energy into electrical energy through chemical reactions occurring…
Correct answer: Dry cell- A. Thermo couple
- B. Photo voltaic cell
- C. Thermistor
- D. Thermostat
Explanation: Thermocouples utilize the Seebeck effect to generate a voltage when there is a temperature difference between two different metals.
Correct answer: Thermo couple